Which component is not typically inspected during a borescope inspection?

• A. Exhaust Duct
• B. Compressor
• C. Combustor
• D. Turbine

Answer: (A)

Borescope inspections focus on viewing the engine’s hot-section components that are most subject to wear and thermal damage and that can be accessed through dedicated viewing ports. You’re looking to assess the compressor blades and vanes, the combustor liners and burners, and the turbine blades and vanes for cracks, fouling, or rubbing, since these areas directly affect performance and safety and are designed for internal inspection through removable covers and ports. The exhaust duct sits downstream of the turbine and isn’t typically reachable through the standard borescope access paths, and it’s not a primary indicator of core engine condition in a routine hot-section check. Because of limited access and its generally lower relevance to the immediate health of the rotating core, the exhaust duct isn’t part of a standard borescope evaluation. If there were a specific concern about the exhaust, other inspection methods or disassembly would be used to examine it more thoroughly.